Predation by invasive signal crayfish on early life stages of European barbel may be limited

摘要: To determine whether or not signal crayfish Pacifastacus leniusculus and native white-clawed Austropotamobius pallipes prey on European barbel Barbus barbus eggs, interstitial free-embryos emergent larvae, experiments were undertaken in salmonid (substratum) incubators (six treatments, four controls) fitted with video recorders. No corpses remains of larvae parts thereof, observed any the containing buried no showed sign attack. However, evidence a catching consuming larva was obtained. There statistically significant differences between either carapace length weight at beginning end experiments. The conservation implications these results are discussed.